<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        /*选择器嵌套的层次越深，那么权重越高*/
    .child{
        color: aqua;
    }
    .parent>.child{
        color:bisque; 
    }
    </style>
</head>
<body>
    <div class="parent">
        <div class="child">child</div>
    </div>
</body>
</html>